package com.infohold.cms.basic.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Util {
	/**
	 * MD5加密
	 * @param s
	 * @return
	 */
	public final static String encryption(String s) {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
				'a', 'b', 'c', 'd', 'e', 'f' };
		char str[] = null;
		byte[] strTemp = s.getBytes();
		// 使用MD5创建MessageDigest对象
		MessageDigest mdTemp;
		try {
			mdTemp = MessageDigest.getInstance("MD5");
			mdTemp.update(strTemp);
			byte[] md = mdTemp.digest();
			int j = md.length;
			str = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte b = md[i];
				// System.out.println((int)b);
				// 将没个数(int)b进行双字节加密
				str[k++] = hexDigits[b >> 4 & 0xf];
				str[k++] = hexDigits[b & 0xf];
			}
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return new String(str);
	}

	// 测试
	public static void main(String[] args) {
		System.out.println(MD5Util.encryption("000000"));
	}
}
